.

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DATE.

UNITED STATESNUCLEAR REGULATORY COMMISSION

WASHINGTON, D. C. 20555

Reply toi301 East Stewart Ave., 203Las Vegas, Nevada 89101

Tels (702) 38-6125FTS. 592-6125

David Brooks, Acting Director, HLPD, MS 4 H 3

Paul T. Prestholt and John W. GilraySr. On-Site Licensing Representatives

March 17, 1992

SUBJECT: OFFICE OF GEOLOGIC DISPOSAL (0D) WEEKLY HIGHLIGHTS FORTHE WEEK ENDING MARCH 6, 1992.

Please find enclosed the above-referenced OGD reportfor the week ending March 6, 1992.

There is nothing requiring specific managementattention in the reports.

nan

cc wencs.: Charlotte Abrams, M/S 4 H 3Rosetta Virgilio, MS 3 D 23Dean Kunihiro, Region 5

NOTE TO CHARLOTTE. Also enclosed is the LLNL YMP Status Report,February, 1992, and a copy of the Preliminary Field CompositeBorehole Log

13250067 20317

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Department of EnergyilYucca Mountain Site Characterization

Project Office WBS 1.2.9.2R 0. Box 98608 QA: N/A

Las Vegas, NV 89193-8608

MAR 1 1992

John W. Bartlett, Director, Civilian Radioactive Waste Management,HQ (RW-1) FORS

OFFICE OF GEOLOGIC DISPOSAL (OGD) WEEKLY HIGHLIGHTS FOR THE WEEK ENDINGMARCH 6, 1992

I. CRITICAL ITEM STATUS - YUCCA MOMNTIN SITE CHARACTERIZATION PROJECT(YMP)

A. Site Characterization Planning

Regulatory Interactions

The Regulatory Interactions Branch staff attended the WasteManagement '92 Conference during the week of March 2, 1992. Theypresented a poster session on geochemistry and staffed the YMPexhibit.

A Technical Direction Letter to the Civilian Radioactive WasteManagement System Management and Operating Contractor (CRNMS MO) onthe Peer Review of Technical Basis for Erosion Topical Report wastransmitted February 24, 1992. A letter was transmitted to theU.S. Geological Survey (USGS) on February 27, 1992, on Directionsfor Assistance in Preparing the U.S. Department of Energy (DOE)Topical Reports on Erosion and Calcite-Silica Deposits.

Exploratory Studies Facility (ESF) Task Force Activities

The ESF Title II 50 percent Design Review has commenced and iscomprised of 25 drawings, 12 analyses, and 74 specifications. Thisreview, consisting of technical and management portions, is expectedto be completed by mid-April 1992. The status is as follows:

Drawings nalsis Specifications

Through Engineering (25) Initial Draft (12) Initial Draft (74)Through Computer-aided.

Draft Design (CADD)(25) Final Draft (12) Final Draft (74)Through Review (25) Review (12) Review (74)

YMP-5

John W. Bartlett -2- MAR 1 1 1992

The following organizations are participating in this 50 percentreview: DOE, M&O, USGS, Sandia National Laboratories (SNL),Los Alamos National Laboratory (Los Alamos), Lawrence LivermoreNational Laboratory (LLNL), Technical and Management SupportServices (T&MSS), Reynolds Electrical and Engineering Co., Inc.(REECo), and Raytheon Services Nevada (RSN).

Drawings Analysis Specifications

Through Engineering (11) Initial Draft (07) Initial Draft (02)Through CADD (02) Final Draft (00) Final Draft (00)Through Review (01) Review (00) Review (00)

Site Characterization Plan (SCP) Progress Report (PR)

PR 5 is still in concurrence at DOE Headquarters (HQ). The guidanceletter for PR 6 was sent to all the participants, the Yucca ountainSite Characterization Project Office (PO) and DOE/HQ onMarch 4, 1992.

SCP Study Plan (SP) Status

No SPs were approved by YMP during this week.

SP BREAKDOWN

In Screening Review ............. 0....................... *... 0In YMP and H Review ............ 4...... ... e...*. 4Awaiting Comment Resolution Meeting ............................ 6Awaiting Author Revision ......... ....................................... . 11In YMP/HQ Verification Audit .............. ..................... 7Preparing to Submit or Awaiting YMP Approval ................... 2U.S. Nuclear Regulatory Commission (NRC) Phase 1 Review ........ 17NRC Acceptance .................. 0 ........... 0....................... 19Total .................................. ........... ............ 66

SCP SP Status:

Total SPs Assigned to Cover 106 Studies ....................... 103Total SPs Submitted for Review

Including Revision to SPs ....... ............................ 66Total SPs Not Yet Submitted for Review ........................ 44

NEW- ___I______-CI

; . .. John W. Bartlett -3- 1 1 19

Received Comments from the State of Nevada .8Responses Transmitted to the State of Nevada.. 5

Received Comments from NRC. 9Responses Transmitted from OGD to DOE/HQ .5

Responses Transmitted from DOE/HQ to NRC ...................... 4

B. Environmental Programs

Envirormental Compliance and Permitting

The Water Appropriations Permit for Well J-13 was received from theNevada State Engineer on March 2, 1992. The permit approves thewithdrawal of .2 cubic feet per second up to 94.83 acre feet peryear for ten years. Permit conditions include implementation of thegroundwater- monitoring plan developed with the National Park Serviceand further regulation should monitoring identify unmitigableimpacts on existing water rights.

C. Field Operations

The Site Manager and Field Operations Center staff participated in,and provided support to, four tours during the past week.

The fourth neutron access borehole, UZN-l1, was completed. It wasbored to a depth of 84.4 feet. REECo rigged up and began work onthe fifth borehole, UZN-36, on February 28, 1992. It is presentlybored to a depth of 26 feet.

The YMP Safety & Health Plan, Revision 1, has been submitted to theOffice of Civilian Radioactive Waste Management for the signaturesof the Director, and the Secretary of Environmental Safety & Health.

The Site Manager initiated job package (JP) authorization for twonew site activities. The first is JP 92-4, UZ-16 Drill Pad andAccess Road. REECo cmmenced site preparation on February 28, 1992.The second activity is JP 92-5, Midway Valley Excavations. Workwill commence next week.

The Site Manager and staff are assisting in accomplishing the YP50% Design Review for ESF, North Portal Title II Design. Commentsare due to SN by close of business March 6, 1992.

I

J John W. Bartlett -4- MAR 1 1 192

Sample Management Facility (SMF)

The core plugger set up was completed and it is now operational.The Information Systems Division began upgrading the SMF networkto Ethernet.

D. Project Planning and Control

Completed the schedule for installation of.Participant Planning andControl System (PACS) Work Stations. Schedule is for March andApril 1992, with all installations to be completed by the end ofApril 1992.

Received &O integrator updates to participant PACS databases,coordinated updates with the participants, and completed input ofdata.

E. Quality Assurance Implementation

No significant new items to report this week.

Determination of Importance and Grading Enhancement (DIGE)

Continuation of Existing Process

The Quality Review Board and associated Assessment Team continue toprovide support to YMPO while the DIGE effort develops a modifiedprocess.

Quality (Q)-List and Q-List Procedure Development

RSN has completed the updates to the various portions of the design.This will allow initiation of revision to the repository, ESF,surface facility and SCP baselines. SNL continues to make scheduledprogress in the development of the process to apply to the alluvium.A March 24, 1992, review meeting is scheduled. Documentation toinitiate the Quality Management Procedure (P) 06-04 review ofSAM 89-7024 was received by M&O. Assessment of potential impactcaused by delays in this logic are being conducted. Discussionsbetween the DIGE staff, YMPO, and HQ have resolved comments onthe draft Administrative Procedure (AP) 6.17Q. Comments from theQWP 06-04 review of the draft Q-Grading procedure are-beingresolved. These efforts are behind schedule and reschedulin isbeing evaluated.

I

n W. Bartlett -5- MAR 1992

Management Control (MC) List and Procedure Development

Comments have been received from the QMP-06-04 review of the draftMC List Procedure (AP 5.40). The results of the requirementsidentification, extraction, and verification exercise are beingevaluated to determine if sufficient information exists as a basisfor the MC Requirements Plan being developed. A team has beenestablished to complete development of this plan. A draft istargeted for March 10, 1992, to be used in review with YMPO. TheRequirements Traceability Network enhancements, including reports,have been developed, but have not been checked out fully due to theemphasis on the above plan. The draft MC System Grading Procedureremains on hold.

Implementation

Initiation by the participants to develop their procedures and listscontinues to be delayed, driven by delays in completion of AP 6.17Qapproval. In addition, the need for participant procedures as aspecific output of this effort is being evaluated.

Task Management

Revision 0 of the DIGE management Plan has been approved. Limiteddistribution will occur during the week of March 9, 1992. Recentlyidentified changes to the DIGE effort are being incorporated inRevision 1 of the Management Plan.

F. Public Outreach and Institutional Activities

On March 3, 1992, Jeanne Cooper, Richard Morissette, Tom Doering,Diane Harrison-Giesler, and Paul Fransioli participated in a ScienceFair at O'Callaghan Junior High School as judges for various studentscience projects.

Various YMP presentations were given at the Waste Management '92Conference in Tucson, Arizona, this week, including presentationsby Carl Gertz and Beatrice Reilly. A. C. Robison attended theconference and met with Nevada Legislature's Committee on High-LevelRadioactive Waste and with various representatives of affected unitsof local government who were also in attendance. Carl Gertz alsogave a presentation to the International Public Communications Forumon March 1, 1992. The YMP exhibit also was set up and staffed forWaste Management '92.

A presentation on the Yucca Mountain Cultural Resources Programwas given by Richard Arnold at W. E. Ferron Elementary School onMarch 6, 1992, and Paul Standish spoke to the Mineral County

John W. Bartlett -6- MA1R I i 1992

F. Public Outreach and Institutional Activities (Continued)

Commission in Hawthorne, Nevada, on March 5, 1992. Richard Lowderand James Bresee gave a presentation in Washington, D.C., onMarch 5, 1992, to discuss Total Quality Management at the FederalQuality Institute's one-day seminar.

Thirty-five junior and senior high school students from the Chamberof Commerce Leadership Program visited the-Yucca MountainInformation Office (YKIO) on March 4, 1992. They toured YMIO andreceived presentations by April Gil on geology and Gregory Fasanoon environmental programs.

An Open House/Tour to Yucca Mountain, Nevada, was conducted onFebruary 29, 1992, with approximately 200 visitors. Tours werealso conducted for KLVX Channel 10 on March 4, 1992, and for WasteManagement '92 on March 6, 1992 (in conjunction with the DOE NevadaField Office).

Because of the overwhelming response to the prior Waste IsolationPilot Plant tours in Carlsbad, New Mexico, two additional toursare scheduled for March 19, 1992, and March 26, 1992.

On February 29, 1992, and March 1, 1992, William macnabb,James Blink, Effie Harle, and Mindy Wadkins participated in DOE'sRegional High School Science Bowl at the University of Nevada,Las Vegas.

The Eureka County Commission has recently opened their YIO.They have been added to the YMPO mailing list.

G. Systems Management and Integration

Geocheistry

No significant new items to report this week.

II. ANALYSIS & VERIFICATION DIVISION

Participated in Management Review of the Title II Design of DesignPackage 1A, North Portal Area on March 2-3, 1992, in Las Vegas, Nevada.

Attended Workshop on Earthquakes and Tectonics, Electric Power ResearchInstitute High-Level Waste Performance Assessment for the ProposedRepository, March 4, 1992, and March 6, 1992, in Arlington, Virginia.

Provided and consolidated DOE comments on the draft General AccountingOffice report entitled "Nuclear Waste: DOE's Repository SiteInvestigations, a Long and Difficult Task."

John W. Bartlett -7- \..J i 11992

Attended Waste Management '92 Conference on March 2-5, 1992, inTucson, Arizona.

Initiated a review of Mined Geologic Disposal System (MGDS) AnnotatedOutline Skeleton Text package. Review comments are due March 10, 1992.

Initiated technical review under AP 1.1OQ for SPs:

8.3.1.2.2.2 R Water Movement Tests (Review comments dueMarch 15, 1992)

8.3.1.15.1.4 Laboratory Determination of the MechanicalProperties of Fractures (Review comments dueMarch 15, 1992)

Completed verification review under Implementing Line Procedure 22.3.1for SP:

8.3.1.2.3.2 -Characterization of.Yucca Mountain Saturated-ZoneHydrochemistry

III. GENERAL INFORMATICN ITEMS

M&O

Efforts have been initiated to define the detailed 2001 plan byJune 2, 1992.

Several meetings held between MGDS Site Integration and the MO SystemsAnalysis Group have resulted in a refined set of KGDS tasks to supportthe thermal loading system study, Phase I. The primary focus of theMGDS Phase I support is in the area of relocation feasibility/conceptdevelopment for in-drift emplacement. The subsurface and waste packagetasks comprise a majority of the MGDS effort related to the study.

T&MSS

-The ESF Design Plan (overall considerations) and ESF Plan (specificconsiderations) are in verification review by the Change Control Boardand for division director approvals prior to their issue.

IL5 ADMS

Recent briefings were given to YMPO regarding the use of tracers. Asfollow-up to these, a letter was sent to the technical project officersrequesting their designation of point of contact in their organizations.

INIONNOMMONNOUNNOr- I

John W. Bartlett -8- I MIR 1 1992

LOS AMOS (Continued)

These contacts will facilitate information exchange and allowPerformance Assessment to track tracer use and evaluate possible impactsto waste isolation integrity, health and safety considerations, andother testing activities.

IV. UXPCMNG EVENTS CLENDAR

Please note that the usage of "(P)" in the calendar indicates that theevent is open to the public. Educational presentations and State andpublic interactions are handled by the Speakers Bureau; contactLinda Artis at (702) 794-7896 or FS 544-7896 for additionalinformation. Exhibits are handled by Kevin Rohrer at (702) 794-7769 orFTS 544-7769, and tours are handled by Mindy Wadkins at (702) 794-7374or FlTS 544-7374.

Date Event Location YMPO Contact

A. DEW Meet

Wednesday,March 25

Program ManagementMeeting

Washington,DC

C. Gertz

B. Internal and DOE/V Meetings

No significant new items to report.

C. NRC Interactions

Tuesday,March 17

Thermal Loads -Albuquerque,NM

T. Bjerstedt

Wednesday,March 18

Tuesday-Wednesday,April 28-29

Air, VaporMovements Due toThermal Gradients

ComplimentaryCumulativeDistribution Function

Albuquerque,NM

Albuquerque,NM

T. Bjerstedt

T. Bjerstedt

Tuesday,May 19

InteractionsSchedulings

Rockville,MD

T. Bjerstedt

Wednesday,May 27

DOE LicensingTopical Report onErosion

Rockville,MD

T. Bjerstedt

/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

6 I John W. Bartlett i-211AR I 1 1992

Date Event Location YMmV Contact

C. NRC Interactions (Continued)

Wednesday,June 3

Drafts on LicenseApplication

Rockville,MD

T. Bjerstedt

(TBD)July 1992

Topical ReportCalcite-Silica

TBD T. Bjerstedt

(TBD)August 1992

WIPP - Briefingand Tour

Carlsbad,NM

T. Bjerstedt

(TBD)September 1992

Total SystemPerformance Assessment

TBD T. Bjerstedt

Date Event Location YMPO Contact

D. Nuclear Waste Technical Review Board (NRIRB) Interactions (P)

Tuesday-Wednesday,March 10-11

NWTMB T&S Panel Arlington,VA

A. Simmons

Monday-Wednesday,April 6-8

Monday,May 11

NWTRB Full BoardMeeting

NWTRB Panel onEBS

Dallas,TX

Hanford,WA

A. Simmons

A. Simmons

Wednesday,May 13

NWTRB Panel onEBS

Idaho Falls,ID

A. Simmons

Tuesday-Friday,July 7-10

NWIRB Full BoardMeeting

Denver,co

A. Simmons

Thursday-Friday,August 13-14

Saturday-Sunday,August 15-16

NWTRB Full BoardMeeting

NWTRB Panel onSG&G

Las Vegas,NV

Las Vegas,NV

A. Simmons

A. Simmons

7~~~~~

K> MAR i 1992John W. Bartlett

Date

-10-

Event Location Speaker

E. State and Public Interactions

Saturday,March 7

Boy Scouts AtomicEnergy Merit BadgeWorkshop

Las Vegas,NV

E. Harle

Monday,March 9

Nevada Nuclear WasteTask Force

Reno,NV

C. Gertz

Tuesday,March 10

LLNL/DOEPressure SafetyConference

Las Vegas,NV

C. Gertz

Tuesday,March 10

Green ValleyLibrary

University of Nevada,Electrical EngineeringHonor Society

Henderson,NV

R. Arnold

Monday,March 16

Reno,NV

C. Gertz

Wednesday,March 18

Southern NevadaFloor CoveringAssociation

Las Vegas,NV

C. Gertz

Tuesday,March 24

Thursday,March 26

Thursday,March 26

USCEA FuelCycle '92 Conference

Family Home Hospice

Yucca MountainLecture Series

Charleston,SC

Las Vegas,NV

YMIO,Beatty, NV

J. Younker

R. Arnold

R. Arnold

Saturday,March 28

Boy Scouts GeologyMerit Badge Workshop

Las Vegas,NV

E. Harle

Tuesday,March 31

Yucca MountainLecture Series

MO,Las Vegas, NV

R. Arnold

Saturday,April 4

Friday,April 10

Girl Scouts MeritBadge Workshop

American PowerDispatchersAssociation

Las Vegas,NV

Las Vegas,NV

E. arle

C. Gertz

. .John W.I;

Bartlett -11-

Date Event Location

E. State and Public Interactions (Continued)

Monday, ASQC Third Las Vegas,

May 4 International Waste NVManagement Conference

Thursday, Nevada Water Savers Las Vegas,

May 7 NV

Date Event Locat

F. Exhibits Scheduled

Saturday, Public Open House (F) Las VMarch 28

-Saturday, Public Open House (P) Las VApril 25

Thursday, Public Open House (P) Las VMay 28

Saturday, Public Open House (P) Las VJune 27

Date Event Escor

G. Tours Scheduled

Tuesday, Monmouth College S. JoMarch 10

Friday, Booker 6th Grade J. CoMarch 13 Center V. Be

Tuesday, DOE Office of Hearings TBD

March 17 and Appeals

Wednesday, Las Vegas Chamber TEDMarch 18 of Commerce

Friday, Chaparral L. ThMarch 20 High School T. Py

Wednesday, Energy Fuels Nuclear M. VoMarch 25

ion

egas,

egas,

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Legas,

ts

MAR 1 1992

Speaker

C. Gertz

R. Arnold

NV

NV

NV

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v-- * I - John W. Bartlett

Date

-12-k' 1992

I . ..

Event Escorts

G. Tours Scheduled (Continued)

Saturday,March 28

Public Open House (P) Various Escorts

Thursday,April 2

Friday,April 17

Wednesday,April 22

DOE Office of Hearingsand Appeals

International High-LevelWaste ManagementConference

Chaparral HighSchool

TBD

K. Beall

TED

Saturday,April 25

Public Open House (P) Various Escorts

MondayMay 11

Institute of ShaftDrilling Technology

Thursday,May 28

Saturday,June 27

Public Open House (P)

Public Open House (P)

Various Escorts

Various Escorts

Carl P. GertzProject ManagerYMP:DLH-2310

- LAWRENCE LIVERIMUxt NA11ViNA L.O

(LLNL)(K, .A #YUCCA MAJNTAIN PROJECT (YMP) STATL>REPORT

FEBRUARY 1992

EXECUTIVE SUMMARY(Items Proposed for Reporting in YMPO or OGD Reports)

1) As a result of the analyses of repository-heat-driven hydrothermal calculations, ithas been recognized that three critical hypothesis tests can be used to help focusmodel validation work and related site characterization activities. The threehypothesis are:

1) Does repository heat-driven-hydrothermal flow dominate the ambienthydrological system?

2) Do boiling conditions and rock dry-out effects dominate hydrologicalperformance?

3) Does the dry-out front correspond to the nominal boiling point isotherm andis far field heat flow dominated by heat conduction?These three hypothesis tests will require large-scale heater tests at multiplehydrostratigraphic horizons within the unsaturated zone at Yucca Mountain or asuitably analogous site, such as Busted Butte. If the answer to each of the threehypothesis tests is yes, then the validation of hydrologic performance models of thesite can be greatly focussed, thereby enhancing the probability that adequatevalidation can be achieved.

2) The flow through spent fuel dissolution testing continued at PNL. Resultscontinued to show that dissolution of unoxidized spent fuel and spent fuel oxidizedto U 40 9 are similar. Similarly, unirradiated U02 and unirradiated U0 2 oxidized toU307 at 250C in a dilute bicarbonate solution had approximately the samedissolution rates.

3) Samples of PNL-76-68, SRL-131, and SRL-165 glasses reacted in water vapor (100%relative humidity) for three years at 75C were removed from the reaction chamberand are being investigated using analytical electron microscopy (AEM). Thesesamples are part of a suite of samples that are being tested to evaluate reaction underconditions likely to be present after containment breach. The questions to beanswered are how much reaction will take place and what are the reaction products.The results from this suite of tests can be compared with tests performed at highertemperature to evaluate temperature as a parameter to accelerate the reaction.Sections of PNL-76-68 and SRL-131 glass have been examined. The SRL-131 glasshas reacted about ten times faster than the PNL-76-68 glass. This result is similar toprevious results at higher temperature in which PNL-76-68 glass reaction appearedto be inhibited due to the formation of Al-bearing secondary phases which quenchthe ion-exchange process. At lower temperatures, the secondary phases are notpresent in sufficient quantity for analysis, but the similarity of low and hightemperature relative reaction rates for these glasses implies that the mechanismmight be the same.

i- - - -

4) The contract wit> Leckie (Stanford University) haJegun. He is developing asemi-empirical model of uranium-goertite surface speciation at elevatedtemperatures and at a range of pH values.

12.1 SYSTEMS

1.2.1.1 Management and Integration

No significant activities.

12.1.24 Systems Engineering Implementation

J. Blink worked with the RSED and SAIC staff to arrange a review and CCBsubmission of LLNL's proposed revision to the SCPB in the areas of Near FieldGeochemistry and Man-Made Materials.

12.1.2.6 YMP Support to Management Systems Improvement Strategy

No significant activities.

1.2.13.5 Technical Database Input

M. Revelli participated in the two technical data meetings in Las Vegas onFebruary 4. The first meeting addressed the development status of the ReferenceInformation Base and the near term engineering/design needs. The second meetingreviewed progress made on the Parameter Normalization task and requestedparticipant comments on the Task Plan, the Parameter Identification listing and theData Dictionary format.

12.1.4.2 Waste Package Performance Assessment

The PANDORA-1.1 code development continued. A prototype version withadvancements in the waste form alteration and release models is being merged intothe main version. A functional and design description was written and reviewedfor the merge, and implementation is in progress. The prototype model usesanalytical solutions rather than finite difference solutions and calculates whether toapply the concentration or matrix-limited release control for each radionuclide, as itdepends on the inputs and on the time-varying inventories. A draft IndividualSoftware Plan for prototyping the PANDORA-1.1 is being reviewed.

D. Stahl, R. Fish, and T. Doering of the M&O staff visited LLNL February 13-14 fordiscussions on integrated testing and performance assessment.

1.214.5 Geochemical Modeling and Database Development

Effort is now focused on review of the four user manuals submitted in Decemberand for the verification/qualification activity for version 7.0 of the EQ3/6 familycode. The verification/qualification effort is being conducted as an independentactivity, in the sense that the code author is not directing or conducting it. The codeauthor is available for consultation on this activity, as needed.

LLNL-February Status Report -2- 3 /6/9 2

At the request of the Abase task, work was completed iV2hecking a tentative set ofnew data files. Some time was spent addressing the technical issues involved inresumption of code development. Discussions have been held within LLNL toidentify these issues and how they might be resolved. There are two immediatetechnical issues. The first issue is a set of changes that would coordinate withchanges to the thermodynamic database including using upper and lower caseletters to identify chemical species. The database task would like some of thesechanges to be implemented in the near future. The second issue concerns theincorporation of an ion exchange submodel into a qualified version of EQ3/6. Thissubmodel has already been developed in a prototype branch version. These issuescould be dealt with by extending version 7.0 to version 7.1. However, version 7.0contains a data structure which dates back to the original version of EQ3/6. A newdata structure is required in order to add a number of other code capabilitiesnecessary for some anticipated YMP-related calculations at LLNL and LANL. Thesecapabilities include redox disequilibrium in reaction path models, mineral surfacespeciation submodels, and solid solution submodels in which importantradionuclides are incorporated at trace levels. It is anticipated that this change ofdata structure would be accomplished in version 8.0, which would also incorporateone or more of the above new capabilities. Another option for dealing with data filechanges and the ion exchange submodel would be to work these into version 8.0directly, bypassing version 7.1. The 7.1 option would give some benefit in theshorter term, the trade-off being that some of the work would have to be redone inversion 8.0.

On President's Day weekend, the hard-disk on the Sun server crashed. GEMBOCHSand its associated software were located on that disk. Most of the files were restoredfrom weekly backup tapes, but the database itself could not be restored from normalbackup tapes (an unanticipated problem due to the recent INGRES upgrade). ADecember INGRES backup was used for database restoration. Efforts are focused onrestoring the database and its software library to their pre-crash state. Operations areexpected to be back to normal by the end of March.

1.2.1.4.7 Supporting Calculations for Postclosure Performance Analyses

This WBS element has not been funded in FY92.

12.2 WASTE PACKAGE

12.2.1 Management and Integration

J. Blink attended a LANL meeting to establish a working group for control ofTracers/Fluids/Materials. The meeting was held in Las Vegas on February 11.

1.2.2.2 Waste Package Environment

The Preliminary Near Field Environment Report in nearly complete. All reviewcomments have been incorporated, and the report will be sent to the Project Officein March.

The near field technical area staff participated in an internal audit February 11-21.

LLNL-February Status Report -3- 3/6/92

1.22±1 Chemical anzineralogical Properties of the Waste Package Environment

B. Viani attended the Geochemistry Integration Team Meeting in Las VegasFebruary 24-25. J. Blink met with A. Simmons on February 28 to arrange LLNLsupport of future GIT activities.

1.2.22 Hydrologic Properties of the Waste Package Environment

T. Buscheck continued to analyze repository-scale and drift-scale hydrothermalmodel calculations of repository-heat-driven hydrothermal flow. For Areal PowerDensity (APD) > 80 kW/acre and 30-and 60-yr-old fuels, the maximum verticalextent of the dry-out zone below the repository horizon was found to beapproximately 166 m, regardless of APD. Above the repository horizon, themaximum vertical extent of dry-out increases with APD.

An important conceptual point is that boiling and rock dry-out occur because thethermal loading conditions and heat conductance of the dry-out zone can drive heatflow to the boiling front faster than the far-field heat conductance can dissipate it.Therefore, an increase in heat convection within the dry-out zone will tend toenhance the rock dry-out rate, while an increase in far field heat convection willtend to retard the dry-out rate. It was found that even when a very large heat-convection-dominated heat-pipe zone existed in the two-phase zone above theboiling zone, boiling and dry-out performance were not significantly reduced by thepresence of the heat-pipe zone. However, heat-convection-dominated heat flow inthe far field (beyond the two-phase zone) has the potential of reducing boiling anddry-out benefits.

The insensitivity of the vertical extent of the lower dry-out zone was attributed totwo effects. First, the water table in the model is represented as a boundary withfixed temperature, saturation, and pressure. Because the water table behaves like atemperature sink, it enhances far field cooling as the dry-out front approaches thewater table, thereby reducing boiling and dry-out effects. The second reason for theinsensitivity of the vertical extent of the lower dry-out zone is the fixed location ofthe water table. Because the water table is not de-watered in these calculations, itprovides an infinite source of water for capillary-driven flow of water back to thedry-out zone. The Equivalent Continuum Model (ECM) assumes that fracture flowwill only occur when the bulk saturation of the equivalent medium, Sb, is greaterthan the critical bulk saturation, Sbcrit. For the 100 n fractures assumed in theECM, Sbcit = 98.4%. The saturation profile below the repository horizon approaches100 percent in the vicinity of the water table. The critical bulk saturation, Sbcrit,occurs approximately 166 m below the repository horizon. The contribution offracture flow to capillary driven flow back toward the dry-out zone has the effect oflimiting the net dry-out to the region where Sb > 98.4%.

As a result of the analyses of repository-heat-driven hydrothermal calculations, ithas been recognized that three critical hypothesis tests can be used to help focusmodel validation work and related site characterization activities. The threehypothesis are:

LLNL-February Status Report -4- 3/6/9 2

1) Does repository heat-driven-hydrothermal flow dominate the ambienthydrological system?

2) Do boiling c4aitions and rock dry-out effe&d-dominate hydrologicalperformance?

j* ' 3) Does the dry-out' front correspond to the nominal boiling point isotherm andis far field heat flow dominated by heat conduction?These three hypothesis tests will require large-scale heater tests at multiplehydrostratigraphic horizons within the unsaturated zone at Yucca Mountain or asuitably analogous site, such as Busted Butte. If the answer to each of the threehypothesis tests is yes, then the validation of hydrologic performance models of thesite can be greatly focussed, thereby enhancing the probability that adequatevalidation can be achieved.

T. Quinn obtained all comments for the Individual Software Plan (ISP) for theinitial qualification of V-TOUGH. She finished implementing the comments andhas sent out the ISP for comment resolution verification.

T. Quinn and S. Daveler have established the process for writing the'V-TOUGHUser Manual. This document will be maintained on S. Daveler's Sun workstationin a Framemaker format. S. Daveler completed a draft of the user input to V-TOUGH which was reviewed and commented on by T. Quinn.

T. Quinn reviewed the software configuration management system with J. Blink.They are verifying compliance with the TIP in preparation for an upcoming DOEaudit. Although it is not currently required to perform configuration managementin accordance with the TIP, by the end of March, compliance with this TIP will bemet.

For the purpose of testing V-TOUGH and the EQ3/6 suites of codes, T. Quinnattended a briefing at the Software Technology Center (STC) on analyzingFORTRAN and C Codes. The STC is a repository for tools that can be used for re-engineering codes and determining testing strategies. T. Quinn discussed testingstrategies with T. Wolery for EQ3NR, EQ6 and EQPT.

T. Quinn ported the STARS reservoir engineering code to the NERSC UNICOS Craycomputers.

S. Daveler debugged several options of Extool which had not been running properlyon Xview (but had been running properly on Sunview).

1.2.223 Mechanical Attributes of the Waste Package Environment

Study Plan 8.3.4.2A.3 is in comment response verification at YMPO and OCRWM.

S. Daveler has been assisting S. Blair in debugging a prototype geomechanical code.The code was converted from S-plus to C, and the changes were verified. S. Davelerwrote a tool to assist in running S. Blair's code and added post-processing graphicscapabilities.

LLNL-February Status Report -5- 3/6/92

- -- - - Hirin g 1111111

1±2724 EBS Field TcJESF Test Design

J. Blink met with H. Kalia (LANL TCO) to discuss options for off-block prototypetesting. T. Buscheck will calculate potential thermal-hydrological experiments inthe Busted Butte stratigraphy.

1.22±5 Man-Made Materials

This WBS element has not been funded in FY92.

12.23 Waste Form and Materials Testing

12.23.1 Waste Form Testing - Spent Fuel

A combined meeting was held on February 10-11 with LLNL, PNL and Canadianstaff at which the US/Canada collaboration agreement (SA-2) was discussed.R. Stout gave an overview presentations of the spent fuel activities at this meetingand at the NRC Technical Exchange in Pasco on February 25.

Spent Fuel Oxidation

Oxidation dry bath testing continued at PNL.

Presentations were given by R. Einziger of PNL on oxidation testing at theDOE/AECL meeting held in Pleasanton on February 10-11 and also at the NRCtechnical exchange at Pasco on February 25.

Spent Fuel Dissolution

Modifications are being made to the experimental procedure used duringdissolution of U02 because dissolved oxygen in the leaching solution permeates thetubing walls and escapes into the glove box. This will be corrected by usingimpermeable metal tubing or by using the same oxygen fugacity outside the systemas is present inside. This change will be reflected in an Activity Plan D-20-53aupdate.

The flow through spent fuel dissolution testing continued at PNL. Resultscontinued to show that dissolution of unoxidized spent fuel and spent fuel oxidizedto U 4 0 9 are similar. Similarly, unirradiated U0 2 and unirradiated U0 2 oxidized toU 3 0 7 at 25*C in a dilute bicarbonate solution had approximately the samedissolution rates.

H. Leider gave a presentation on dissolution testing at the DOE/AECL meeting heldin Pleasanton on February 10-11. S. Steward gave a presentation on dissolutiontesting at the NRC technical exchange at Pasco on February 25.

W. Gray of PNL made presentations on dissolution testing at the DOE/AECLmeeting held in Pleasanton on February 10-11 and also at the NRC technicalexchange at Pasco on February 25.

LLNL-February Status Report -6- 316/9 2

A paper is being co-a 'iored by W. Gray (PNL), H. Leir - S. Nguyen, S. Steward,and H. Weed of LLNL-Sn the most recent U02 dissolutioi-esults (LLNL) and SpentFuel dissolution results (PNL). This paper will be submitted to the Journal ofNuclear Materials.

Materials Characterization Center

The following paper has been sent to YMPO for review"Microstructural.Analyses of LWR Spent Fuel at High Burnup" by L. Thomas,

C. Beyer and L Charlot.

1.2.2.3.12 Waste Form Testing - Glass

This WBS element has received limited funding in FY92. These funds are beingused to maintain the N2 and N3 tests at ANL

The N2 tests (SRL actinide-doped glass) continue with no sampling period occurringthis month. These tests have been in progress for 312 weeks. The N3 tests (ATM-10,a West Valley actinide-doped glass) continue and have been in progress for230 weeks.

Samples of PNL-7648, SRL-131, and SRL-165 glasses reacted in water vapor (100%relative humidity) for three years at 750C were removed from the reaction chamberand are being investigated using analytical electron microscopy (AEM). Thesesamples are part of a suite of samples that are being tested to evaluate reaction underconditions likely to be present after containment breach. The questions to beanswered are how much reaction will take place and what are the reaction products.The results from this suite of tests can be compared with tests performed at highertemperature to evaluate temperature as a parameter to accelerate the reaction.These data are being collected, and a paper entitled "Low-Temperature VaporAlteration of Glass Under Potential Storage Conditions" is being prepared forinclusion in the Yucca Mountain Project Special Issue of the Journal of NuclearMaterials.

Sections of PNL-76-68 and SRL-131 glass have been examined. The SRL-131 glasshas reacted about ten times faster than the PNL-76-68 glass. This result is similar toprevious results at higher temperature in which PNL-76-68 glass reaction appearedto be inhibited due to the formation of Al-bearing secondary phases which quenchthe ion-exchange process. At lower temperatures, the secondary phases are notpresent in sufficient quantity for analysis, but the similarity of low and hightemperature relative reaction rates for these glasses implies that the mechanismmight be the same. - -

The following paper was reviewed and verbally approved by YMPO:"Colloid Formation During Waste Form Reaction: Implications for Nuclear

Waste Disposal" by J. K. Bates, J. P. Bradley, A. Teetsov, C. R. Bradley (all of ANL)and M. Buchholtz ten Brink-(LLNL).

LLNL-February Status Report -7- 3 /6/92

1.23.2 Metal Ba;.,rs

J. Blink met with TEMET staff in Henderson, NV on February 12 to discuss advancesin titanium alloy design and the potential for single point monitoring of titaniumcontainers to detect the onset of crevice corrosion.

J. Blink met in Las Vegas with D. Jones of the University of Nevada (Reno) onJanuary 29 to discuss potential work by UNR on waste package corrosion usingcooperative agreement funding. LLNL can provide QA support and technicaldirection of the work in FY92 and perhaps augment it with programmatic funds inFY93.

1.2.3.4.1 Integrated Radionuclide Release

G-20-2 Determination of Elemental Profiles in Rocks. Minerals, and Glasses usingthe Ion Microscope

The following TIPs were completed and distributed:1) TIP-PA-01, Depth Profiling on the Ion Microscope,2) TIP-PA-02, Data Reduction for Depth Profiles, and3) TIP-YM-9, Dektak HA, Surface Profiling

G-20-3 Interactions of Actinide-bearing Solutions with Rock Core Samples

Preliminary Scanning Electron Microscopy (SEM) analysis of the core sample to beused in the initial flow-through experiment was completed. The surface of afracture was found to be mineralogically similar to a non-fracture surface with theexception that the fracture surface contained an unidentified iron-bearing phase.

G-20-5 Interaction of Materials under Repository Conditions

A tentative protocol was established for sampling the fluids in the U02 flowthrough experiments.

G-20-6 Source Term Development

The contract with J. Leckie (Stanford University) has begun. He is developing asemi-empirical model of uranium-goertite surface speciation at elevatedtemperatures and at a range of pH values.

1.2±3.4.2 Thermodynamic Data Determination

This WBS element has not been funded in FY92.

12.2.4. Design, Fabrication, and Prototype Testing

1.24.1 Waste Package Design

This WBS element has not been funded in FY92.

LLNL-February Status Report -8- 3/6/92

f 1.2.2.4.2 Container Fabrication and Closure Development

This WBS element has " been funded in FY92. K

1.2.2.3 Container/Waste Package Interface Analysis

CAD waste package drawings were generated for the M&O. Plans to conductthermal analyses of robust waste package internals were initiated: these analyses willbegin in late March.

J. Blink reviewed the draft Waste Package Implementation Plan.

12.5 REGULATORY AND INSTITUTIONAL

1.2.5.2.1 NRC Interaction Support

D. Wilder and J. Blink attended a meeting of the NWTRB Engineered Barriers Panelheld in Augusta, GA on February 11. D. Wilder participated in the SRL tour thefollowing day. J. Blink attended the dry run for the meeting on February 4 and 7and provided information to R. Morissette for incorporation into his presentation.

R. Stout, S. Steward and J. Blink participated in the NRC Technical Exchange onSpent Fuel in Pasco, WA on February 25. They also participated in the PNL(Hanford) tour the following day.

J. Blink worked with YMPO staff to establish the agenda for the March 18 NRCTechnical Exchange in Albuquerque, NM (Air and Vapor Movement due toThermal Gradients).

1.2.5.2.2 Site Characterization Program

M. Revelli represented LLNL at the February 14 meeting of the Integrated TestEvaluation (ITE) task.

A copy of the Scientific Notebook maintained by LLNL as part of the ESSE task wasforwarded to SAIC in response to their request to complete the ESSE RecordsPackage.

1.2.5.2.4 Technical Support Documentation

No significant activities.

1.2.5.2.5 Study Plan Coordination

D. Chesnut completed the review of the USGS Study Plan 8.3.1.2.2.9, "SiteUnsaturated-Zone Modeling and Synthesis" on February 10 and transmitted hiscomments to YMPO.

S. Blair has started the review of the SNL Study Plan 8.3.1.15.1.4, "LaboratoryDetermination of the Mechanical Properties of Fractures".

LLNL-February Status Report .9_ 3/6/92

J. Nitao has startede review of the USGS Study Pl• 8.3.1.2.2.2, Rev. 1, "WaterMovement Test".

L2.5.2.6 Semi-Annual Progress Reports

No significant activities.

_ 12.9 PROJECT MANAGEMENT

1.2.9.1.1 Management

R. Godman and H. Benton of the M&O visited LLNL on February 20, 1992 and werebriefed by the technical staff.

W. Clarke attended the Engine of Evolution meetings in Las Vegas on February 24,27 and 28.

J. Blink met with M&O and SAIC staff on January 27 to discuss installation of aspent fuel assembly at the LLNL/B&W exhibit in the FOC.

J. Blink met with H. Kahlia (LANL) to discuss approaches to off-block field testingneeded prior to ESF testing, e. g., testing of the extended-dryout repository scenario.

J. Blink met with W. Andrews, D. McNelis, W. Wells, R. Boehm, and other UNLVprofessors on February 13 to discuss opportunities for LLNL-UNLV collaboration.J. Blink arranged for the V-TOUGH (heat and mass transport), TOPAZ (3-D transientheat transfer), and NIKE/DYNA (stress analysis) codes to be provided by LLNL toUNLV. He also provided information on criticality codes, concluding that MCNP-4.2 and KENO-5A are the best options for UNLV. Those codes are available fromthe Radiation Shielding Information Center at Oak Ridge. KENO is part of a largerpackage (SCALE-4.1) that also includes the ORIGEN code that can be used tocalculate radionuclide generation and decay.

J. Blink attended an update meeting of the DIGE (QA Grading/Classification) task onFebruary 6 in Las Vegas.

J. Blink served as a moderator for the DOE Science Bowl competition in Las Vegason February 29.

P. Comstock and E. Campbell participated in a tour of Yucca Mountain andsupporting facilities at YMPO on February 34.

1.2.9.1.4 Records

Document Control issued seven Change Notices and two new documents undercontrolled distribution. Routine follow-up for receipt acknowledgementscontinues.

LLNL-February Status Report -10- 3 /6/9 2

A total of 165 items were logged into the LLNL-YMP tracking system. This includes31 records/records pa' ges that were processed througY z the CRF. Five action

.. Items were closed. K~ '

1±79.2 Project Control

The January FIE report was submitted to YMPO. The monthly actual costs forOctober 1991 through January 1992 for the PACS database were submitted to YMPO.

J. Podobnik attended a meeting with the GAO auditors on February 14 to discussissues associated with management accounts (WBS element 1.2.9) for FY90 throughFY92.

J. Norman was assigned to focus on issues raised in the YMPO-DOE PropertyControl/Management audit conducted in January. A conference call was held withYMPO-DOE Property Management on February 18 to discuss progress on resolvingthe findings in the audit. A training program has been developed in associationwith LLNL Property Management. All LLNL-YMP staff will be required to attendone of three sessions scheduled for March.

J. Podobnik attended an ICE briefing held in Las Vegas on February 20 to discuss thepurpose, methods, topics and schedule of reviews which will to be conducted at eachparticipant site. LLNL will be visiting during the week of March 23.

J. Podobnik attended the YMPO project control steering committee meeting in LasVegas on February 21. Topics discussed included ICE review background andrequirements, integration and planning out to 2001, and transition of tasks to theM&O. The M&O presented related guidance they have received from DOE in termsof conducting oversight planning. Level 0 and 1 milestones will be proposed by theM&O and its subcontractors to define and integrate future work. Dates will be setand participants will be offered the opportunity to review. Participants will then berequired to cost the plan. Formal kickoff for this effort will take place at the nextscheduled TPO meeting. The steering committee also heard a progress report fromthe procedures subcommittee and took action to submit a revision of the existingCapital Equipment procedure.

J. Podobnik, J. Blink and LLNL-YMP technical managers provided information tothe M&O in support of the PACS scrub exercise.

J. Podobnik attended an Assist Training course conducted by LLNL AIS personnelon February 13.

J. Podobnik participated in a tour of Yucca Mountain and supporting facilities onFebruary 19.

1.2.9.3 Quality Assurance

LLNL-YMP Audit Report 92-02, Engineering and Performance Analyses, wascompleted and distributed. Three Adverse Finding Reports were issued.

LLNL-February Status Report -1I- 3 /6/92

Internal Audit 92-0? 'ear Field Environment Charact jation, was conducted onFebruary 13 - 18. u

The Trend Analysis Report for calendar year 1991 was completed and distributed onFebruary 27.

Quality Assurance Program Plan Change Notice R 1-1-2, Organization, wascompleted and submitted to YMPO for review and approval.

Quality Procedure Change Notice 17.0-3-1, Quality Assurance Records, wascompleted and distributed.

Technical Implementing Procedure TIP-YM-09, Dektak IA Surface Profiling System,was distributed.

Technical Implementing Procedure TIP-YM-12, Electronic Record Keeping, authoredby J. Blink, was distributed internally for review and comment.

Work continues on revisions of Quality Procedures 4.0 and 17.0.

J. Blink met with R. Weeks on January 31 and February 11 in Las Vegas to discussLLNL-YMP QA grading packages and the scope of LLNL-YMP technical work.R. Weeks will be the lead auditor for the April 21-24 YMPO audit of LLNL-YMP.

R. Monks attended the DIGE (QA Grading/Classification) meeting in Las Vegas onFebruary 6.

LLNL-February Status Report -12- 3 /619 2

) Department of EnergyYucca Mountain Site Characterization

Project Office WBS 1.2.3.5P. 0. Box 98608 QA: N/A

Las Vegas, NV 89193-8608

MAR i 1 1992

Carl H. Johnson, State of Nevada, Carson City, NVPhillip Niedzielski-Eichner, ye County, Chantilly, VADennis A. Bechtel, Clark County, Las Vegas, NVAlbert C. Douglas, City of Las Vegas, Las Vegas, NVPaul T. Prestholt, NRC, Las Vegas, NV

PRELIMINARY FIELD COMPOSITE BOREHOLE LOG

For your information, enclosed is a copy of the Preliminary Field CompositeBorehole Log-for-borehole USW UZN-11 which was developed by the DrillingSupport and Sample Management Department of Technical and Management SupportServices. Borehole geophysical logging of this hole was performed onFebruary 25, 1992. Geophysical logging information produced was utilized inconjunction with core and sample cuttings information to develop thispreliminary field composite borehole log.

If you need additional information regarding the log, please contactUel S. Clanton at (702) 794-7943.

r P rzRSED:USC-2227 Project Manager

Enclosure:Composite Borehole Log

cc w/o encl:J. H. Peck, SAIC, Las Vegas, NVC. L. Lugo, SAIC, Las Vegas, NVP. E. Seidler, SAIC, Las Vegas, NVR. L. Bullock, RSN, Las Vegas, NVJ. R. Dyer, YMP, NVA. C. Robison, YMP, NV

YMP-6

2=0021=0�� -- ---

�4 -�

- - v

- - YUCCA MOUNTAIN SITE CHARACTERIZATION PROJECT- PRELIMINARY FIELD COMPOSITE BOREHOLE LOG

BORE HOLE ID: USW UZN-11

STUDY PLAN NO.: 8.3.1.2.2.1

CORE SIZE: H2.25"

DRILL DATES: 215/92 2/25/92

ALLUVIUM

NON-WELDED

.-.FPARTIALLY WELDED

DENSELY WELDED

BEDDED TUFF

VITROPHYRE

GROUND ELEVATION: 5220 t USL (est.)

GROUND COORDINATES: N 780,600 E 59,000 (est.)AW: Arways

SPC: Stones per Carat

SS: Surface SetTOTAL DEPTH: 84.4

ANGLE FROU VERT.: NAI LOG VERSION DATE

2 / 2 BEARING: NA

geology by Drilling Support DivisIon, Drilling Support and Sample Management Dept., T&MSSU -.

FRAC FREG(XIS FT)

I

20 0 50

-j0

6-

W

t;

LITHOLOGYREMARKS

..... .. ... 2..I......- -.+

-50 1 00...... - .....

0.0- 1.7 Alluvium; unconsolidated materialfrom drive coresTop TIVA CANYON mbr @ 1.7

1.7 - 10.0 Tuft, ashflow; pale red, moderatelyto densely welded, devitrified; 5% phenocrystsof sanidine with scattered plagioclase and someblack mafics; scattered glassy shards, some asremnant vesicle walls; pumice dark brown toblack, dovitrifled, flattening ratio 5:1, some to2 cm; fractures common, coated with dullorange clay and minor calcitefrom 5.0-6.9, Increasing glassy shardsfrom 6.9-10.0. pyrolusite blooms common

NOTE: No drilling 26/92 - 219/92 due tofishing operations and rain

I7

8

10.0 - 13.4 Tuft, ashlow; very pale orangeto yellowish gray, moderately welded; 1%pumice fragments with Fe stained alterationhalos; minor blotite; dark yellow-orange clay.on fractures

13.4 - 18.5 Tuft, ashtlow; light brown-gray.moderately to densely welded; < 1% pumice;manganese dendrite coatings; dark yellow.orange clay on fractures

18.5 - 25.2 Tuft, ashflow; light brown-gray,moderately welded; minor lithosphysae;sanidine common; gray-orange clay onfractures

25.2 - 27.3- Tuft, ashflow; gray-red,nonweldedTop BEDDED TUFFS @ 27.3

9

20.8/19.091.3% 1

10

I

-14 '

I I I I'ThI sL <

YUCCA MOUNTAIN SITE CHARACTERIZATION PROJECT . pg. 2 of 3PRELIMINARY FIELD COMPOSITE BOREHOLE LOG (cont.) USW UZN-11

geology by Drilling Support Dvision, Drilling Support and Sample Management Dept., TMSS

1

2/21/92

12

13

14

15

19.7/13.971% m

2/24/92

16

- I17

- I

18

_ I119

27.3 - 30.8 Tuff, ashfall; bedded, moderatered brown, nonwelded; < 5% pumice

30.8 - 32.0 Tuff, ashfall; light yellow towhite, nonweldod; 10% light pink devitrifledpumice; 35% black vitric fragments

32.0 - 36.4 Tuff, ashfall; dark grey brown,nonwelded; 15% subangular to angular lithcs;scattered black glassy blobs

36.4 - 46.0 Tuff, ashfall; dark grey brown,nonwelded, vitric; sparse phenocrysts ofsanidine; 35% light pink woody vitric pumice;scattered angular lithics; very abundant blackglass as blobs, shards, and remnant vesicles;matrix contains abundant subrounded milkywhite reworked? material

46.0 - 50.5 Tuft, ashtall; buff to light brown,nonwelded, vitrlc?; Interval composed of wellsorted, subrounded, opaque, slightlyargillaceous material resembles sandstone;abundant white woody vitric pumice; intervalsoft and crumbly; scattered light yellowsmears or blabs - possibly zeolite?

50.5 60.6 Tuft, ashfall; white, non-welded,vtric; 15% potassium feldspar phenocrysts;up to 80% white vitric pumice lapilli; up to 5%rhyolite lithic fragments, subangular and red togray in color; lapilil size Increases downhole;high angle (approx 60 degrees) fault contact at60.6, Yucca Mountain mbr. on downhole side.

Top YUCCA MOUNTAIN mbr 0 60.6

60.6 - 68.7 Tuft, ashflow; light gray to darkgray, partially devitrified, non to moderatelywelded; 5% potassium feldspar phenocrysts,2% pumice apill, 1- 2% lthIc fragments;Increasing amount of very small lthophysaeand vesicles downhole.

68.7 - 71.5 Tuft, ashflow; moderately todensely welded; abundant very small voidspaces and Ithophysas.

.1

_________________ __.

: Al - -

YUCCA MOUNTAIN SIT HARACTERIZATION PROJECT pg 3 of 3PRELIMINARY FIELD COMPOSITE BOREHOLE LOG (cont.) USW UZN-1 I

geology by Drilling Support Division, Drilling Support and Sample Management Dept., T&MSS

20 Ijll5[_________- l - 71.5 * 84.4 Tuff, ashflow; densely welded,

|lJ ' . tW>,..:i::S.Zw&:^:5'l 1...... 4 9 X >vitric from 71.5-75.2, devitrified from. 1 .'...7.2-84.4 som xol49 ~4~75.2-84.4; some axiolitic pumice fragments.

TOTAL DEPTH @ 84.4